A high-pressure or ultra-high-pressure canned pump

Abstract

The invention relates to the field of canned-motor pumps, in particular to a high-pressure and superhigh pressure canned-motor pump. The high-pressure and superhigh pressure canned-motor pump consistsof a pump head, a vane wheel, a motor housing, a motor stator, a motor lead assembly, a shielding sleeve, a motor rotor, a pump head bearing assembly, a rear cover, a rear cover bearing assembly, a pressure balancing diaphragm, a supporting seat A and a supporting seat B. Through the adoption of the high-pressure and superhigh pressure canned-motor pump disclosed by the invention, the disadvantage of a conventional canned-motor pump that along with the rising of the pressure of a transported fluid, the shielded sleeve of a motor is thickened, so that the efficiency of the motor is reduced, and high-pressure and superhigh fluid transporting cannot be performed, is overcome, and the disadvantage of conventional relevant matched members that sealing of a 'high-pressure and superhigh medium environment shielding motor' is not reliable enough, inert liquid stuffed in the stator expands when being heated and contracts when being cooled easily causes damage to the pressure balancing diaphragm and the shielded sleeve, a lead wire of the motor stator is difficult to mount and connect is also overcome, so that the high-pressure and superhigh pressure canned-motor pump is reliable to seal; the shielded sleeve is free from the influence that the inert liquid expands when being heated and contracts when being cooled; the mounting and repairing are convenient; and the high-pressure and superhigh pressure canned-motor pump has popularization and application value.

Description

[0001] 1. Technical field [0002] The invention relates to the field of canned pumps, in particular to a high-pressure or ultrahigh-pressure canned pump. [0003] 2. Technical background [0004] The shielded pump is manufactured by combining the pump and the motor as a whole. The impeller of the pump and the rotor of the motor are integrated, and the rotor and stator of the motor are separated by a shielding sleeve. The outstanding feature of the canned pump is the non-shaft seal structure. The conveying liquid is statically sealed with the outside world, which can be completely leak-free. Therefore, the canned pump is especially suitable for conveying flammable, explosive, highly corrosive, valuable, radioactive and highly toxic. of liquid. The shielding sleeve in the canned pump is one of its core components. As the liquid delivery pressure increases, the traditional method is to increase the thickness of the shielding sleeve to ensure its strength. However, for high-press...

AI Technical Summary

Problems solved by technology

The shielding sleeve in the canned pump is one of its core components. As the liquid delivery pressure increases, the traditional method is to increase the thickness of the shielding sleeve to ensure its strength. However, for high-pressure or ultra-high-pressure liquids, if the traditional method is adopted, the motor efficiency will be reduced Severe drop, so currently canned pumps are only suitable for low and medium pressure liquids

The China Intellectual Property Office announced on August 22, 2017, the application publication number is CN107084159A, and the invention patent titled "An External Circulation Shielded Pump" is aimed at cooling the motor by using the conveying liquid through the gap between the shielding sleeve and the motor rotor. It is necessary to empty the conveying liquid of the cooling motor, which wastes the conveying liquid and causes environmental pollution. A pair of impellers is installed at the end of the motor rotor away from the pump casing, and the conveying liquid of the cooling motor is connected to the pump inlet and the motor rotor and shielded. The technical scheme that the outer circulation pipe in the gap between the sleeves is sent back to the pump inlet, but it still does not solve the problem that the wall thickness of the shielding sleeve increases with the increase of the liquid delivery pressure

Authorized by the China Intellectual Property Office on June 16, 2010, the authorized announcement number is CN101359849 B, and the invention patent named "High-voltage and ultra-high-voltage medium environment shielded motor" has the shielding sleeve that does not cause stress due to high-voltage or ultra-high-pressure medium pressure. Advantages, it provides favorable conditions for the combination of innovative high-pressure or ultra-high pressure canned pumps; however, this patented technology has the shielding sleeve and pressure balance diaphragm with O-ring seals, and the seal is not reliable; the structure of the shielding sleeve and pressure balance diaphragm cannot be eliminated. Due to the difference between the filling temperature of the inert liquid and the working temperature, the volume of the inert liquid expands and contracts, which easily damages the shielding sleeve and the pressure balance diaphragm due to thermal stress; it is difficult to connect the lead wires of the motor stator, and it is not easy to install and maintain. Implementation of technology in combinatorial innovative high-pressure or ultra-high-pressure canned pumps

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